Look for the Manufactor web site, look for support or download or help, etc..
They will normally have the drive you need, make sure it is for the correct computer system windows XP, 7 linux or apple, etc...
You don't say a make, maybe
I-TECH CAMERA 7 MP model 3809
http://yella-perdana.com/index.php?route=product/product&product_id=78
You may find some drive links at:=
http://www.acomputerportal.com/hardware.html
Drivers, July 2011